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$ javac CallProc3.java $ java CallProc3 conn=oracle.jdbc.driver.T4CConnection@2a340e param2=abcd param3=20 -----------------------------------Now, we can check to see if a CallableStatement supports ParameterMetaData: // // Step-5.5: get ParameterMetaData // ParameterMetaData pmeta = cs.getParameterMetaData(); if (pmeta == null) { System.out.println("Vendor does not support ParameterMetaData"); } else { System.out.println(pmeta.getParameterType(1)); System.out.println(pmeta.getParameterType(2)); System.out.println(pmeta.getParameterType(3)); } If you add these lines to the CallProc3 class (call the new class CallProc3WithMetadata) and run the program again, you will get the following error (this means that Oracle does not support the CallableStatement.getParameterMetaData() method): $ javac CallProc3WithMetadata.java $ java CallProc3WithMetadata conn=oracle.jdbc.driver.T4CConnection@2a340e java.sql.SQLException: Unsupported feature at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:125) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:162) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:227) at oracle.jdbc.driver.DatabaseError.throwUnsupportedFeatureSqlException( DatabaseError.java:537) at oracle.jdbc.driver.OraclePreparedStatement.getParameterMetaData(Oracle PreparedStatement.java:9086) at CallProc3WithMetadata.main(CallProc3WithMetadata.java:49) There is an alternative way that you can get the metadata information on a stored procedure s parameters: you can use Connection.getMetaData(), which will give you a DatabaseMetaData object, and then using that DatabaseMetaData object, you can get the signature of all stored procedures by using the following methods: // retrieves a description of the stored procedures // available in the given catalog. ResultSet getProcedures(String catalog, String schemaPattern, String procedureNamePattern)
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// retrieves a description of the given catalog's // stored procedure parameter and result columns. ResultSet getProcedureColumns(String catalog, String schemaPattern, String procedureNamePattern, String columnNamePattern)
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5.9. How Do You Get ParameterMetadata from Stored Procedures (MySQL)
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The current production version of MySQL does not support stored procedures, but the Beta version of MySQL (5.0+ version) does. For details on stored procedures, refer to MySQL s documentation and reference manuals. Next, let s set up a stored procedure (called simpleproc), and invoke it using a CallableStatement. Then, we ll invoke CallableStatement.getParameterMetaData() to get the stored procedure s parameters metadata. First, define a very simple stored procedure in MySQL that has one output parameter: mysql> use octopus; Database changed mysql> create table test(id varchar(4)); Query OK, 0 rows affected (0.11 sec) mysql> insert into test(id) values('a'); mysql> insert into test(id) values('b'); mysql> select count(*) from test; +----------+ | count(*) | +----------+ | 2 | +----------+ 1 row in set (0.00 sec) mysql> delimiter // mysql> CREATE PROCEDURE simpleproc (OUT param1 INT) -> BEGIN -> SELECT COUNT(*) INTO param1 FROM test; -> END -> // Query OK, 0 rows affected (0.08 sec) mysql> delimiter ; mysql> describe simpleproc; ERROR 1146 (42S02): Table 'octopus.simpleproc' doesn't exist mysql> CALL simpleproc(@out_param1); Query OK, 0 rows affected (0.05 sec) mysql> select @out_param1;
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+-------------+ | @out_param1 | +-------------+ | 2 | +-------------+ 1 row in set (0.00 sec) mysql> SHOW PROCEDURE STATUS LIKE 'simpleproc'\G *************************** 1. row *************************** Db: octopus Name: simpleproc Type: PROCEDURE Definer: root@localhost Modified: 2005-09-18 21:59:09 Created: 2005-09-18 21:59:09 Security_type: DEFINER Comment: 1 row in set (0.03 sec) import java.sql.*; import jcb.util.DatabaseUtil; public class CallSimpleProc { public static Connection getConnection() throws Exception { String driver = "com.mysql.jdbc.Driver"; String url = "jdbc:mysql://localhost/octopus"; String username = "root"; String password = "root"; Class.forName(driver); // load MySQL driver return DriverManager.getConnection(url, username, password); } public static void main(String[] args) { Connection conn = null; try { // // Step-1: get a database connection // conn = getConnection(); System.out.println("conn="+conn); // // Step-2: identify the stored procedure // String proc3StoredProcedure = "{ call simpleproc( ) }";
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// // Step-3: prepare the callable statement // CallableStatement cs = conn.prepareCall(proc3StoredProcedure); // // Step-4: set input parameters ... NONE // // // Step-5: register output parameters ... // cs.registerOutParameter(1, java.sql.Types.INTEGER);
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// // Step-6: execute the stored procedures: proc3 // cs.execute(); // // Step-7: extract the output parameters // int param1 = cs.getInt(1); System.out.println("param1="+param1); System.out.println("------------------------------------"); // // Step-8: get ParameterMetaData // ParameterMetaData pmeta = cs.getParameterMetaData(); if (pmeta == null) { System.out.println("Vendor does not support ParameterMetaData"); } else { System.out.println(pmeta.getParameterType(1)); } } catch(Exception e){ e.printStackTrace(); System.exit(1); } finally { DatabaseUtil.close(conn); } } }
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